CN103265937B - Be applicable to the of the fracturing fluid gel breaker of class A foam A - Google Patents
Be applicable to the of the fracturing fluid gel breaker of class A foam A Download PDFInfo
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- CN103265937B CN103265937B CN201310162521.2A CN201310162521A CN103265937B CN 103265937 B CN103265937 B CN 103265937B CN 201310162521 A CN201310162521 A CN 201310162521A CN 103265937 B CN103265937 B CN 103265937B
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- iodate
- bromate
- gel breaker
- potassium
- sodium
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Abstract
The invention discloses and be applicable to the of the fracturing fluid gel breaker of class A foam A, it is one or both mixtures in iodate and bromate; Described iodate is one or more mixtures in potassium periodate, sodium periodate, Potassium Iodate, sodium iodate; Described bromate is one or both mixtures in potassium bromate, sodium bromate.The invention has the beneficial effects as follows: there is few, the broken glue advantage rapidly and thoroughly of consumption, add under cryogenic this gel breaker a small amount of can realize fracturing liquid fast, thorough broken glue, the broken glue time is short, and broken glue is effective, solves the of the fracturing fluid broken glue difficult problem of class A foam A.
Description
Technical field
The present invention relates to and be applicable to the of the fracturing fluid gel breaker of class A foam A.
Background technology
Even if low for the nocuity of hypotonic compact reservoir fracturing liquid own, if but fracturing fluid recovery (backflow) speed is slow, the row of returning leads low, be detained in the earth formation by increasing reservoir water saturation, increasing two phase fluid flow resistance, producing the injury such as water-sensitive, water lock, significantly can reduce oozing property of earth bore, even shut hydrocarbon zone, have a strong impact on after fracturing yield increasing effect is even pressed and there is no production capacity.For solving the row's of returning problem, omnidistance liquid nitrogen is adopted to accompany note, average every well time amount of liquid nitrogen 5-10m
3left and right, but liquid nitrogen companion note brings larger trouble to site operation, and also liquid nitrogen is deposited and also be there is the cost of use that larger problem too increases liquid nitrogen car and liquid nitrogen pump vehicle, has had a strong impact on fracturing effect.Especially liquid nitrogen mixes the row's of returning difficult problem that note can not solve the filtrate of invaded formation matrix, and the flowback effect that a lot of low pressure oil gas well liquid nitrogen is mixed after note sandfrac is also poor.For solving the problem, automatic foaming supercharging system is incorporated in conventional hydroxypropyl guar fracturing fluid system, and supporting adding specially can make it crosslinked special linking agent in acid condition and define class A foam A fracturing fluid system.This New Low Damage Fracturing Fluid system is a kind of cost higher than common aqueous fracturing fluid (mix with liquid nitrogen and form this and to maintain an equal level or lower slightly), have the advantages that automatically release heat in the earth formation, generate gas, be conducive to fracturing liquid broken glue rapidly, and there is the filtrate reducing of similar foamed fracturing fluid and the fracturing fluid system of " supercharging helps row " characteristic.This fracturing fluid system can reduce the injury to reservoir, improves fractured well effect of increasing production further.Thought by evaluation and application, this fracturing liquid can use the stratum use being very suitable for the row of returning difficulty after the strong stratum of water sensitivity, the more serious stratum of leak-off injury, stratum that formation temperature is on the low side, stratum that reservoir pressure is on the low side, pressure break in wide temperature range.Geologic condition is more severe, formation temperature pressure is lower, then its technology economy advantage is more obvious.
Class A foam A fracturing fluid system is due to plastic under mildly acidic conditions, what therefore adopt is the cross-linking system different in the basic conditions from conventional hydroxypropyl guar, if glue will inevitably be caused brokenly because mechanism of crosslinking there are differences employing in broken glue process not thorough with gel breaker like alkaline condition lower class, particularly under middle cold condition, conventional break agent does not produce effect to crosslinked shape class A foam A fracturing fluid system substantially, therefore must develop the gel breaker supporting with class A foam A fracturing fluid system.
In fracturing process, make thickness fracturing liquid controllably be degraded into the wash that can return discharge from crack, the reagent that gelled fracturing fluid can be made to break glue is called gel breaker.Desirable gel breaker is at whole liquid and take in sand process, and should remain desirable high sticky, once pumping is complete, liquid is broken gel water at once.Gel breaker is the main ingredient in fracturing liquid.The gel breaker that current scene is commonly used can be summarized as following a few class: 1. superoxide, as ammonium persulphate, Potassium Persulphate etc., its use temperature is more than 50 DEG C, when use temperature is lower than 50 DEG C, the speed of its release free oxygen slows down or stops, and does not just have or partly play brokenly glue in fracturing liquid; 2. enzyme, can be used as the broken glue under lesser temps, but must maintain at low ph when using, and enzyme just can play brokenly the effect of glue, and harsh application conditions and expensive cost constrain its large-scale application; 3. potential acid, as ethyl acetate type organic, it mainly relies on its pH value being hydrolyzed into sour change system to destroy of the fracturing fluid structure.But also need certain temperature and other condition; 4. capsule breaker. be a kind of Delayed Release Breaker, compare the broken glue being applicable to high temperature fracture liquid.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, provide few, the broken glue of a kind of consumption to be applicable to the of the fracturing fluid gel breaker of class A foam A rapidly and thoroughly.
Object of the present invention is achieved through the following technical solutions: be applicable to the of the fracturing fluid gel breaker of class A foam A, and it is one or both mixtures in iodate and bromate.
Described iodate is one or more mixtures in potassium periodate, sodium periodate, Potassium Iodate, sodium iodate.
Described bromate is one or both mixtures in potassium bromate, sodium bromate.
Described iodate is the mixture of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate, and the weight ratio of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate is: 1:0.55:0.42:0.33.
Described bromate is the mixture of potassium bromate and sodium bromate, and the weight ratio of potassium bromate and sodium bromate is: 1:0.625 ~ 0.9.
Described iodate and the weight ratio of bromate mixture are 1:0.61; Described iodate is the mixture of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate, and the weight ratio of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate is: 1:0.55:0.42:0.33; Bromate is the mixture of potassium bromate and sodium bromate, and the weight ratio of potassium bromate and sodium bromate is: 1:0.67.
The present invention has the following advantages: the present invention has few, the broken glue advantage rapidly and thoroughly of consumption, and add this gel breaker a small amount of under cryogenic and can realize fracturing liquid thorough broken glue fast, the broken glue time is short, and broken glue is effective; Can realize class A foam A fracturing liquid broken glue smoothly within the scope of differing temps, solve the problem that traditional gel breaker can not break at a lower temperature or thoroughly can not break glue, the lower advantage of temperature is further obvious, has good using value.
Below by experiment, effect of the present invention is further described:
Evaluate this gel breaker broken glue effect under cryogenic, monitoring frozen glue viscosity situation over time, and break glue effect by whether returning the synthetic determinations such as glue after broken glue.
Evaluating the base fluid formula adopted is: 0.4% hydroxypropyl guar+4.9% Sodium Nitrite+6.3% ammonium chloride+0.3% sterilant+0.5% clay stabilizer+0.5% cleanup additive+0.2%PH conditioning agent+0.4% linking agent.
(1) gel breaker of the present invention is 50 DEG C of broken glue effects
Under this temperature condition, it is as shown in table 1 that the gel breaker of the present invention of different amounts breaks glue effect
Table 1 gel breaker of the present invention is 50 DEG C of broken glue situations
After general requirement breaks glue, breaking glue solution viscosity is less than 5mpa.s; Under 50 DEG C of conditions, gel breaker consumption of the present invention only needs to reach more than 600ppm and just thoroughly can break glue fast, and without returning glue after broken glue, respond well.
With conventional break agent ammonium persulphate, comparative evaluation breaks glue effect in table 2
Table 2 gel breaker of the present invention is with traditional gel breaker broken glue performance comparison at 50 DEG C
Conclusion: relative to traditional ammonium persulphate gel breaker, gel breaker of the present invention can realize when consumption is less thoroughly breaking glue, and the timely consumption of traditional gel breaker doubly still thoroughly can not break glue at gel breaker 3-5 of the present invention.
(2) gel breaker of the present invention is 40 DEG C of broken glue effects
Under 40 DEG C of conditions, it is as shown in table 3 that the gel breaker of the present invention of different amounts breaks glue effect
Table 3 gel breaker of the present invention is 40 DEG C of broken glue situations
Test to show under 40 DEG C of conditions that gel breaker consumption of the present invention only need reach more than 800ppm just can thorough broken glue fast, and after broken glue, nothing returns glue, respond well.
With conventional break agent ammonium persulphate, comparative evaluation breaks glue effect in table 4
Table 4 gel breaker of the present invention is with traditional gel breaker broken glue performance comparison at 40 DEG C
Conclusion: relative to traditional ammonium persulphate gel breaker, gel breaker of the present invention can realize when consumption is less thoroughly breaking glue, and the timely consumption of traditional gel breaker still has very large gap in gel breaker of the present invention 3 times of effects.
(3) gel breaker of the present invention is 30 DEG C of broken glue effects
Under 30 DEG C of conditions, it is as shown in table 5 that the gel breaker of different amounts breaks glue effect
Table 5 gel breaker of the present invention is 30 DEG C of broken glue situations
Test to show that under 30 DEG C of cold condition gel breaker consumption of the present invention reaches 1500ppm can reach brokenly glue object, and without returning glue after broken glue, respond well.
With conventional break agent ammonium persulphate, comparative evaluation breaks glue effect in table 6
Table 6 gel breaker of the present invention is with traditional gel breaker broken glue performance comparison at 30 DEG C
Conclusion: use the super gel breaker of the present invention can realize class A foam A fracturing liquid broken glue smoothly within the scope of differing temps, solve the problem that traditional gel breaker can not break at a lower temperature or thoroughly can not break glue, the lower advantage of temperature is further obvious, has good using value.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, and protection scope of the present invention is not limited to the following stated:
Embodiment 1:
Be applicable to the of the fracturing fluid gel breaker of class A foam A, it is iodate, and described iodate is the mixture of potassium periodate and sodium periodate, and the two weight ratio can be arbitrary value.
Embodiment 2:
Be applicable to the of the fracturing fluid gel breaker of class A foam A, it is iodate, and described iodate is the mixture of sodium iodate and Potassium Iodate, and the two weight ratio is 1:1.1 ~ 1.5.
Embodiment 3:
Be applicable to the of the fracturing fluid gel breaker of class A foam A, it is iodate, described iodate is the mixture of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate, and the weight ratio of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate is: 1:0.55:0.42:0.33.Embodiment 4:
Be applicable to the of the fracturing fluid gel breaker of class A foam A, it is iodate, and described iodate is potassium periodate.
Embodiment 5:
Be applicable to the of the fracturing fluid gel breaker of class A foam A, it is bromate, and described iodate is potassium bromate.
Embodiment 6:
Be applicable to the of the fracturing fluid gel breaker of class A foam A, it is bromate, and described bromate is the mixture of potassium bromate and sodium bromate, and the weight ratio of potassium bromate and sodium bromate is: 1:0.625 ~ 0.9.
Embodiment 7:
Be applicable to the of the fracturing fluid gel breaker of class A foam A, it is the mixture of iodate and bromate, and described iodate is the mixture of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate, and weight ratio is: 1:0.55:0.42:0.33.Described bromate is the mixture of potassium bromate and sodium bromate, and weight ratio is: 1:0.67; The weight ratio of final gel breaker iodate and bromate mixture is 1:0.61.
Claims (1)
1. be applicable to the of the fracturing fluid gel breaker of class A foam A, it is iodate and bromate two kinds of mixtures, it is characterized in that: described iodate and the weight ratio of bromate mixture are 1:0.61; Described iodate is the mixture of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate, and the weight ratio of potassium periodate, sodium periodate, Potassium Iodate and sodium iodate is: 1:0.55:0.42:0.33; Described bromate is the mixture of potassium bromate and sodium bromate, and the weight ratio of potassium bromate and sodium bromate is: 1:0.67.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310162521.2A CN103265937B (en) | 2013-05-07 | 2013-05-07 | Be applicable to the of the fracturing fluid gel breaker of class A foam A |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310162521.2A CN103265937B (en) | 2013-05-07 | 2013-05-07 | Be applicable to the of the fracturing fluid gel breaker of class A foam A |
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| CN103265937A CN103265937A (en) | 2013-08-28 |
| CN103265937B true CN103265937B (en) | 2015-10-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481608A (en) * | 2009-01-19 | 2009-07-15 | 中国石油大学(华东) | Clean fracturing fluid and use thereof |
| CN102803432A (en) * | 2009-09-21 | 2012-11-28 | 贝克休斯公司 | Metal-mediated viscosity reduction of fluids gelled with viscoelastic surfactants |
| WO2013043243A1 (en) * | 2011-09-19 | 2013-03-28 | Gupta, D.V. Satyanarayana | Compositions and methods of treating high temperature subterranean formations |
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2013
- 2013-05-07 CN CN201310162521.2A patent/CN103265937B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481608A (en) * | 2009-01-19 | 2009-07-15 | 中国石油大学(华东) | Clean fracturing fluid and use thereof |
| CN102803432A (en) * | 2009-09-21 | 2012-11-28 | 贝克休斯公司 | Metal-mediated viscosity reduction of fluids gelled with viscoelastic surfactants |
| WO2013043243A1 (en) * | 2011-09-19 | 2013-03-28 | Gupta, D.V. Satyanarayana | Compositions and methods of treating high temperature subterranean formations |
Non-Patent Citations (1)
| Title |
|---|
| 《化学化工大辞典》编委会、化学工业出版社辞书编辑部.《化学化工大辞典》.《化学化工大辞典》.化学工业出版社,2003,(第1版), * |
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| CN103265937A (en) | 2013-08-28 |
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